If I attend a meeting, and am listening to what is said, I will invariably doodle something in the margin of my notes. And when I am lecturing, I am not surprised to see people make little drawings of things I have mentioned. If you speak about, say, Herodotus‘ hippopotamus and the long western tradition of deliberately incorrect descriptions of that animal,* you will see a lot of students drawing hippos.
Medieval copiists couldn’t resist the temptation either. Their manuscripts often contain little drawings. Two weeks ago, one of the libraries of Bruges announced that an astronomer who was consulting a thirteenth-century manuscript of the Almagest of Ptolemy of Alexandria, had discovered two small portraits of the great astronomer. The ink is now a bit pale, but you can clearly see that the copiist has done his best, making a pretty, detailed picture of what he thought Ptolemy must have looked like. I think it is beautiful.
*The best one is, of course, T.S. Eliot’s Hippopotamus.